Abstract: A prosthesis for mechanical suspension on a human shoulder blade utilizing a swivel joint system formed by a sphere adapted to be fixed to the shoulder blade by a rod integral with an implant anchored in the shoulder blade socket, as well as a humeral cupula articulated to the sphere and adapted to be fixed to the humerus by a diaphyseal projection supporting the cupula and implanted in the humerus, the cupula having a hollow inner hemispherical surface and an open side terminating in surface edges, the axis of the diaphyseal projection passing approximately through the center of the sphere and forming an angle of about 10.degree.